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## Re: How to calculate visible vertical beam-height

**From**: |
David Kastrup |

**Subject**: |
Re: How to calculate visible vertical beam-height |

**Date**: |
Sun, 02 Jun 2019 20:33:02 +0200 |

**User-agent**: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |

Thomas Morley <address@hidden> writes:
>* Am So., 2. Juni 2019 um 17:26 Uhr schrieb <address@hidden>:*
>*>*
>* many thinks for your detailed explanations.*
>
>* First I translated your*
>*> total height = thickness + blot / cos(atan(slope))*
>* into guile, making for:*
>* (+ thick (/ blot (cos (atan slope))))*
>
>* Though, guile has sometimes problems with trigonemetric procedures if*
>* the angle gets close to multiples of PI/4. I was beaten by this*
>* problem before.*
So don't use them.
cos(atan(slope)) = 1 / sqrt (1 + slope^2)
--
David Kastrup